debugger: Add locator for Python tasks (#31533)

Closes #ISSUE

Release Notes:

- debugger: Python tests/main functions can now we debugged from the
gutter.

---------

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/debugger_ui/src/debugger_panel.rs

@@ -295,7 +295,6 @@ impl DebugPanel {
                         })
                     })?
                     .await?;
-
                 dap_store
                     .update(cx, |dap_store, cx| {
                         dap_store.boot_session(session.clone(), definition, cx)

crates/debugger_ui/src/session/running.rs

@@ -547,6 +547,10 @@ impl RunningState {
                     .for_each(|value| Self::substitute_variables_in_config(value, context));
             }
             serde_json::Value::String(s) => {
+                // Some built-in zed tasks wrap their arguments in quotes as they might contain spaces.
+                if s.starts_with("\"$ZED_") && s.ends_with('"') {
+                    *s = s[1..s.len() - 1].to_string();
+                }
                 if let Some(substituted) = substitute_variables_in_str(&s, context) {
                     *s = substituted;
                 }
@@ -571,6 +575,10 @@ impl RunningState {
                     .for_each(|value| Self::relativlize_paths(None, value, context));
             }
             serde_json::Value::String(s) if key == Some("program") || key == Some("cwd") => {
+                // Some built-in zed tasks wrap their arguments in quotes as they might contain spaces.
+                if s.starts_with("\"$ZED_") && s.ends_with('"') {
+                    *s = s[1..s.len() - 1].to_string();
+                }
                 resolve_path(s);
 
                 if let Some(substituted) = substitute_variables_in_str(&s, context) {